Read all properties from properties file

This Program describes about the reading of all the properties from a property or config file using Java.

import java.io.*;
import java.util.*;

public class ReadProperty {
 String str, key;

 public static void main(String[] args) {
  ReadProperty r = new ReadProperty();
 }

 public ReadProperty() {
  try {
   int check = 0;
   while (check == 0) {
    check = 1;
    BufferedReader bf = new BufferedReader(new InputStreamReader(
      System.in));
    System.out
      .print("Enter file name which has properties extension :");
    str = bf.readLine();
    File f = new File(str + ".properties");
    if (f.exists()) {
     Properties pro = new Properties();
     FileInputStream in = new FileInputStream(f);
     pro.load(in);
     System.out.println("All key are given: " + pro.keySet());
     System.out.print("Enter Key : ");
     key = bf.readLine();
     String p = pro.getProperty(key);
     System.out.println(key + " : " + p);
    } else {
     check = 0;
     System.out.println("File not found!");
    }
   }
  } catch (IOException e) {
   System.out.println(e.getMessage());
  }
 }
}